Class A - Tropical Climates
Class A climates are characterized by constant high temperatures (at sea level and low elevations)
with year round
average temperatures of 18 °C (64.4 °F) or higher.
|
Class |
Name |
Description |
European Cities in This Class |
Af | Tropical Rainforest |
Year–round average precipitation of at least 60 mm (2.4 in). Usually occur within 5–10° latitude (North and South) of the equator. In some Eastern-coast areas, they may extend to as much as 25° away from the equator. This climate is dominated by the doldrums low-pressure system all year round, so has no natural seasons. |
|
Am | Tropical Monsoon |
This type of climate (Am), most common in South America, results from the monsoon winds which change direction according to the seasons. This climate has a driest month (which nearly always occurs at or soon after the "winter" solstice for that side of the equator) with rainfall less than 60 mm, but more than 1/25 the total annual precipitation. |
|
|
Aw | Tropical Savanna (Wet and Dry Climate) |
Class Aw climates have a pronounced dry season, with the driest month having precipitation less than 60 mm and less than 1/25 of the total annual precipitation. |
|
Class B - Dry (Arid and Semiarid) Climates
Class B Climates are characterized by potential evaporation and transpiration exceeding precipitation.
These climates are usually found in areas from 20 - 35° North and South of the equator and in large continental regions of the mid-latitudes often surrounded by mountains.
|
Class |
Name |
Description |
European Cities in This Class |
BWh |
Hot Desert Climate |
Hot desert climates usually feature hot, sometimes exceptionally hot, periods of the year. In many locations featuring a hot desert climate, maximum temperatures of over 40 °C (104 °F) are not uncommon in summer and can soar to over 45 °C (113 °F) in the hottest regions. |
|
BWk |
Cold Desert Climate |
Cold desert climates (BWk) sometimes feature hot and dry summers, though summers typically are not quite as hot as summers in hot desert climates. Unlike hot desert climates, cold desert climates sometimes feature cold winters with marginal snow. Cold desert climates are typically found at higher altitudes than hot desert climates, and are usually drier than hot desert climates. |
|
BSh |
Hot Semi-Arid Climate | Coldest month has an average temperature above 0 °C (32 °F) |
|
|
BSk |
Cold Semi-Arid Climate | At least one month's averages below 0 °C (32 °F) |
|
Class C - Temperate (Mesothermal) Climates
Class C climates have an average monthly high temperature of 10 °C (50 °F) or more in
the spring/summer months (April to September in northern hemisphere),
and an average monthly low temperature greater than −3 °C (27 °F) in the fall/winter months.
|
Class |
Name |
Description |
European Cities in This Class |
Csa |
Hot-Summer Mediterranean Climate |
Csa Mediterranean Climates mostly occur on the western sides of continents between the latitudes of 30° and 45°.[6] These climates are in the polar front region in winter, and thus have moderate temperatures
and changeable, rainy weather. Summers are hot and dry, due to the domination of the subtropical high pressure systems, except in the immediate coastal areas, where summers are milder due to the nearby presence of cold ocean currents that may bring fog but prevent rain. |
|
Csb |
Warm-Summer Mediterranean Climate | coldest month averaging above 0 °C (32 °F), all months with average temperatures below 22 °C (71.6 °F), and at least four months averaging above 10 °C (50 °F). At least three times as much precipitation in the wettest month of winter as in the
driest month of summer, and driest month of summer receives less than 30 mm (1.2 in). |
|
Cwa |
Warm Oceanic Climate / Humid Subtropical Climate | Hot Summer Temperatures Greater than or equal to 22 °C |
|
Cwb |
Subtropical highland climate or temperate oceanic climate with dry winters. |
Coldest month averaging above 0 °C (32 °F), all months with average temperatures below 22 °C (71.6 °F), and at least four months averaging above 10 °C (50 °F). |
|
|
Cwc |
Cold subtropical highland/Subpolar Oceanic |
Cold subtropical highland climate or subpolar oceanic climate with dry winters. Coldest month averaging above 0 °C (32 °F)
and 1–3 months averaging
above 10 °C (50 °F). At least ten times as much rain in the wettest month of summer as in the driest month of
winter (alternative definition is 70% or more of average annual precipitation is received in the warmest six months). |
|
Cfa |
Humid Subtropical Climate | oldest month averaging above 0 °C (32 °F) and at least one month's average temperature above 22 °C (71.6 °F) and at least four months averaging above 10 °C (50 °F). No significant precipitation difference between seasons (neither abovementioned set of conditions fulfilled). |
|
Cfb |
Temperate Oceanic Climate | coldest month averaging above 0 °C (32 °F), all months with average temperatures below 22 °C (71.6 °F), and at least four months averaging above 10 °C (50 °F). No significant precipitation difference between seasons (neither abovementioned set of conditions fulfilled). |
|
Cfc |
Subpolar Oceanic Climate | coldest month averaging above 0 °C (32 °F) and 1–3 months averaging above 10 °C (50 °F). No significant precipitation difference between seasons (neither abovementioned set of conditions fulfilled). |
|
Class D - Continental (Microthermal) Climates
These climates have an average temperature above 10 °C (50 °F) in their warmest months, and a coldest
month average below −3 °C (or 0 °C in some versions, as noted previously). These usually occur in the
interiors of continents and on their upper east coasts, normally north of 40°N. In the Southern Hemisphere,
group D climates are extremely rare due to the smaller land masses in the middle latitudes and the almost
complete absence of land at 40–60°S, existing only in some highland locations.
|
Class |
Name |
Description |
European Cities in This Class |
Dsa |
Humid Continental Climate - Dry Warm Summer |
Coldest month averaging below 0 °C (32 °F) and at least one month's average temperature above 22 °C (71.6 °F) and at least four months averaging above 10 °C (50 °F). At least three times as much precipitation in the wettest month of winter as in the driest month of summer, and driest month of summer receives less than 30 mm (1.2 in). |
|
Dsb |
Humid Continental Climate - Dry Cool Summer |
Coldest month averaging below 0 °C (32 °F), all months with average temperatures below 22 °C (71.6 °F), and at least four months averaging above 10 °C (50 °F). At least three times as much precipitation in the wettest month of winter as in the driest month of summer, and driest month of summer receives less than 30 mm (1.2 in). |
|
Dsc |
Continental Subarctic - Cold Dry Summer |
Coldest month averaging below 0 °C (32 °F) and 1–3 months averaging above 10 °C (50 °F). At least three times as much precipitation in the wettest month of winter as in the driest month of summer, and driest month of summer receives less than 30 mm (1.2 in). | |
Dsd |
Continental Subarctic - Dry Summer, Very Cold Winter |
Coldest month averaging below −38 °C (−36.4 °F) and 1–3 months averaging above 10 °C (50 °F). At least three times as much precipitation in the wettest month of winter as in the driest month of summer, and driest month of summer receives less than 30 mm (1.2 in). |
|
Dwa |
Humid Continental Hot Summers With Dry Winters |
Coldest month averaging below 0 °C (32 °F) and at least one month's average temperature above 22 °C (71.6 °F) and at least four months averaging above 10 °C (50 °F). At least ten times as much rain in the wettest month of summer as in the driest month of winter (alternative definition is 70% or more of average annual precipitation is received in the warmest six months). |
|
Dwb |
Humid Continental Mild Summer With Dry Winters |
coldest month averaging below 0 °C (32 °F), all months with average temperatures below 22 °C (71.6 °F), and at least four months averaging above 10 °C (50 °F). At least ten times as much rain in the wettest month of summer as in the driest month of winter (alternative definition is 70% or more of average annual precipitation is received in the warmest six months). |
|
Dwc |
Subarctic With Cool Summers And Dry Winters |
coldest month averaging below 0 °C (32 °F) and 1–3 months averaging above 10 °C (50 °F). At least ten times as much rain in the wettest month of summer as in the driest month of winter (alternative definition is 70% or more of average annual precipitation is received in the warmest six months). |
|
Dwd |
Subarctic With Cold Winters And Dry Winters |
coldest month averaging below −38 °C (−36.4 °F) and 1–3 months averaging above 10 °C (50 °F). At least ten times as much rain in the wettest month of summer as in the driest month of winter (alternative definition is 70% or more of average annual precipitation is received in the warmest six months). |
|
Dfa |
Humid Continental Hot Summers With Year Around Precipitation |
coldest month averaging below 0 °C (32 °F) and at least one month's average temperature above 22 °C (71.6 °F) and at least four months averaging above 10 °C (50 °F). No significant precipitation difference between seasons (neither abovementioned set of conditions fulfilled). |
|
Dfb |
Humid Continental Mild Summer, Wet All Year |
coldest month averaging below 0 °C (32 °F), all months with average temperatures below 22 °C (71.6 °F), and at least four months averaging above 10 °C (50 °F). No significant precipitation difference between seasons (neither abovementioned set of conditions fulfilled). |
|
Dfc |
Subarctic With Cool Summers And Year Around Rainfall |
coldest month averaging below 0 °C (32 °F) and 1–3 months averaging above 10 °C (50 °F). No significant precipitation difference between seasons (neither abovementioned set of conditions fulfilled). |
|
Dfd |
Subarctic With Cold Winters And Year Around Rainfall |
coldest month averaging below −38 °C (−36.4 °F) and 1–3 months averaging above 10 °C (50 °F). No significant precipitation difference between seasons (neither abovementioned set of conditions fulfilled). |
|
Class E - Polar and Alpine Climates
|
Class |
Name |
Description |
European Cities in This Class |
ET |
Tundra Climate |
Warmest month has an average temperature between 0 and 10 °C. These climates occur on the northern edges
of the North American and Eurasian land masses, and on nearby islands.
ET climates are also found on some islands near the Antarctic Convergence, and at high elevations
outside the polar regions, above the tree line. |
|
EF |
Ice Cap Climate | This climate is dominant in Antarctica and inner Greenland, but also occurs at extremely high altitudes on mountains, above even tundra. All twelve months have average temperatures below 0 °C (32 °F) |
|